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COMP Cams 51-423-11 Xtreme Energy Hydraulic Roller Camshaft Pontiac - 265-455

(Pontiac GTO 1964-73, Firebird 1967-77, 1979, Grand Prix 1962-73, 1975-79, Grand Am 1973-75, 1978-79, Bonneville 1958-71, 1973-79 + 14 more models)

Part of: COMP Cams Xtreme Energy Hydraulic Roller Camshaft GM

Other options in this family: COMP Cams 08-500-8 COMP Cams 20-811-9 COMP Cams 20-810-9 COMP Cams 07-503-8 COMP Cams 12-408-8

Manufacturer

Picture for manufacturer COMP Cams

Part Number

51-423-11
11 reviews
Sale Price

$608.95

In Stock (5)

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Product Details

The COMP Cams 51-423-11 Xtreme Energy hydraulic roller camshaft is engineered specifically for Pontiac 265-455 cubic inch V8 engines. This performance camshaft delivers excellent mid-range to top-end power with a aggressive idle quality, making it ideal for street/strip applications and muscle car builds seeking substantial performance gains over stock.

Camshaft Specifications:

  • Intake Duration: 224 degrees @ .050"
  • Exhaust Duration: 230 degrees @ .050"
  • Hydraulic roller lifter design for reduced friction and increased durability
  • Improved throttle response and acceleration across the RPM range
  • Recommended RPM range: 1,500-5,800 RPM
  • Requires aftermarket valve springs and compatible roller lifters

Key Features:

  • Xtreme Energy profile optimized for maximum power without sacrificing street manners
  • Roller design reduces valve train friction compared to flat tappet cams
  • Precision ground on state-of-the-art CNC equipment for consistent lobe profiles
  • Compatible with stock or aftermarket cylinder heads and intake manifolds
  • Excellent choice for engines with compression ratios between 9.0:1 and 10.5:1

This camshaft works exceptionally well with headers, performance intake systems, and other bolt-on modifications. Professional installation is recommended along with proper valve train components including pushrods, rocker arms, and COMP Cams valve springs matched to this cam profile. Requires hydraulic roller lifters (sold separately).

Products specifications

Fits

Pontiac GTO 1964-73, Firebird 1967-77, 1979, Grand Prix 1962-73, 1975-79, Grand Am 1973-75, 1978-79, Bonneville 1958-71, 1973-79, LeMans 1963-74, 1976-77, 1979, Catalina 1955-79, Tempest 1961, 1963-70 + 11 more models

Basic Operating RPM Range

1,800-5,000

Grind Number

XR276HR

Exhaust Valve Lift

0.51

Intake Valve Lift

0.502

Cam and Lifter Kit Upgrade

CL51-423-11

K-Kit Upgrade

K51-423-11

SK-Kit Upgrade

SK51-423-11

Engine Family

Pontiac 265-455 C.I. 8 Cylinder (1955-1981)

Usage

Street/Performance

Assembly Lubricant Included

No

Camshaft Gear Attachment

1-Bolt

Lifters Included

No

LOBE SEPARATION

110

Valve Springs Required

Yes

Prop 65

WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov

C.A.R.B. Exempt for Foreign Vehicles Manufactured Before 1967?

Yes, but must meet tailpipe emission standards for year of vehicle.

C.A.R.B. Exempt for On-Road Vehicles?

No

C.A.R.B. Exempt for Racing and Off-Road Only Vehicles?

Yes, but must be a race/competition only vehicle.

C.A.R.B. Exempt for California Certified Vehicles Manufactured Before 1965?

Yes, but must meet tailpipe emission standards for year of vehicle.

C.A.R.B. Exempt for Federally Certified Vehicles Manufactured Before 1967?

Yes, but must meet tailpipe emission standards for year of vehicle.

Lifter Type

Hydraulic Roller

Exhaust Duration at .050 inch Lift

230

Cam Type

Hydraulic Roller

Camshaft Material

Billet Steel

Advertised Exhaust Duration

282

Intake Duration at .050 Inch Lift

224

Advertised Intake Duration

276

Camshaft Series

Xtreme Energy

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